

package com.hazelcast.client.impl;

import com.hazelcast.client.Client;
import com.hazelcast.client.ClientListener;
import com.hazelcast.client.ClientService;
import com.hazelcast.instance.impl.Node;
import com.hazelcast.spi.impl.NodeEngine;
import com.hazelcast.spi.impl.eventservice.EventRegistration;
import com.hazelcast.spi.impl.eventservice.EventService;

import javax.annotation.Nonnull;
import java.util.Collection;
import java.util.UUID;

import static com.hazelcast.internal.util.Preconditions.checkNotNull;

/**
 * The default implementation of the {@link ClientService}.
 */
public final class ClientServiceProxy implements ClientService {

    private final ClientEngine clientEngine;
    private final NodeEngine nodeEngine;

    public ClientServiceProxy(Node node) {
        this.clientEngine = node.clientEngine;
        this.nodeEngine = node.nodeEngine;
    }

    @Nonnull
    @Override
    public Collection<Client> getConnectedClients() {
        return clientEngine.getClients();
    }

    @Nonnull
    @Override
    public UUID addClientListener(@Nonnull ClientListener clientListener) {
        checkNotNull(clientListener, "clientListener should not be null");

        EventService eventService = nodeEngine.getEventService();
        EventRegistration registration = eventService.registerLocalListener(ClientEngineImpl.SERVICE_NAME, ClientEngineImpl.SERVICE_NAME, clientListener);
        return registration.getId();
    }

    @Override
    public boolean removeClientListener(@Nonnull UUID registrationId) {
        checkNotNull(registrationId, "registrationId should not be null");

        EventService eventService = nodeEngine.getEventService();
        return eventService.deregisterListener(ClientEngineImpl.SERVICE_NAME, ClientEngineImpl.SERVICE_NAME, registrationId);
    }
}
